I’m trying to do a water change and I can’t manually control anything. I have a red flashing light on my head unit, so I did some research and found that it’s a bus lock. I started disconnecting each expansion one by one but still had a problem. Only thing I had plugged into the expansion hub was my dimming expansion and I couldn’t get the lights to come on. So I took the expansion hub out of the loop and plugged my dimming expansion directly into the relay box and they worked. Only problem now is none of my other expansions are able to be plugged in. Question is can I use a usb hub instead of the expansion hub?